Sheet metal and pipe cutter



INVENTOR ATTORNEY 5 I FMHOOZQ 5 Q?! 31;;

F. M. HQOLEY I SHEET METAL AND PIPE CUTTER Filed Dec. 12,' 1955 Feb, 26, 1935.

Patented Feb. 26, 1935 v A u vs c1aiins."(o1;1e4=- 4 J This. invention relates to sheet metal: cutting implements; my principalobject-beingto provide a;'simple.implementforthe purpose, adapted' for use insheet metal shops as1well as bytinsmiths;

5 by'means of which sheet metal-either; in flat sheet' formpr in cylindrical. or similar fo'rm, may be easily cut with a. minimum of physical: effort. AL further object is to constructthe deviceso that itimay be easily'mounted on an. ordinary'bench Theideviceisalso of: suchan. inexpensive nature that it is within the reach of any worker in the industry and'is ofso simplea character thatthere i'sgnothing likely to give. trouble at anytime.

These objects I accomplish by'means of such structure and relative" arrangement. of. parts as will fully appeanby aperusal. of the following specification and claims.

' Inuthe drawing.similar'characters'of reference Figurei Lisa side elevationaof the implement showing the blades intheir lowered positionand;

with: the pipeslitter its operating position:

Figure 2'isa sectional elevation of the imple'-' 5 ment showing the blades raised ready to make V Figure 5 Figure 1.

is a similar vi w on the line 5-5 of Referring now more particularly to the characters of reference on the drawing, theframe of the implement comprises a pair of horizontal transversely spaced bars 1 and 2 having spacers 3 at, their ends tied together by bolts 4 through the bars and spacers. spaced legs 5 provided with fiat feet-6 extending therebetween, which are formed with slots 7 ex tending lengthwise of the frame and both open to the same end thereof. The slots serve toreceive the upper endsof lag bolts 8 which are secured to a bench 9 on which the implement rests, the heads of the bolts bearing against the top of the feet. This method of-mounting the frame enables the same to be easily withdrawn from engagement with the bolts so that'it may be turned to occupy another position on the bench in connection with other bolts as operating conditions may require. V g V Mounted in the bars intermediate their end is a bolt 10, serving as r a pivot blade 11 disposed between the bars and projecting towardone end indicateicorresponding parts in. the several views: i

The bars also have short ward movement of the handle of the same. The under edge of this blade is thei'icuttingi edge thereof-"and" cooperate's w-ith the adjacent portion ofthe bar 1 which bevelled asat'i'12 to formaistationary blade. The bolt enages a slot 13 cut in the hub '14 in the blade under the cutting 'edge and facing the outerend of, theblade'. The: purpose of this arrangement Will -be seen later; The blade beyond the pivot is formed with a longitudinally extending cam-portionl5 of substantially semi-elliptical shape. up; or .thetlike and will occupyaminimum of space.

hub -17 of a-blade18; This-blade is providedatits outer end with; a 'longitudinallyextending" but vertically offset handle 19 which extends beyond the corresponding end of the frame; the adjacent spacer 3 limiting the downward movement of the blade. The lower cutting edge of the blade also cooperates with the banthe upper edge of which is bevelled as at 20 to form a stationary blade.

I At its'end'facing thecam1'5, thehubl'lis for-med with a relatively l'ong cam rib 21;- normal l'yprojecting under-the cam 15; The front surfac'e ofath'e hub 17 from its junctionfwith the lip orexten'sion 21 to the top'* of'thehub', is co'ncavely curved} as at 22,making anangleofsubstantially 9'0 with-thelipan'd adaptedto engage the upper b'e .-considered*as the cooperating socket of the handle bladearefsd designed' relative to each other and-so positioned relative to the pivots of blades arei horizontal;

the blades that when the u I the under surfaceof the cam 15" and the I lip" 21 flatly engage each other, as shown in Figure 1, while the upper surface ofithe cam and the surface 22 diverge somewhat from each other, with the tip of the cam and the corner of the socket:

point of engagement to. its outer end causes the path of rotation of the tip of the cam, preventing further downwardmovement of said cam or upwardmovement of the blade. Also further upblade is prevented by aremovable stop pin 23 mounted in the bars 1 and 2n the back of the hub 17 and engaging a stop 24' formed onthe back end of the lip 21.

surface of the cam 15. The cam-and-what may Figure 4' is a. cross section onthe line 4 4. of; 3mFigureI; 1 i

With the downward cutting movement of the,

blade the contactof the cam and socket and the slit.

relative movements thereof are of course reversed. V f

With this arrangement either blade may be used selectively since neither one interferes with the operation of the other. If at any time the blade 11 1s not wanted the pin 23 is withdrawn, allowing further upward movement of the handle blade sufiicient to disengage the cam from the lip 21. This enables said blade llto be raised toa vertical position so that it may be slid down and disengaged from the pin 10 as shown in FigureB, when the implement is disengaged from the holding bolts 8. I v 1 In connection with this implement I mount an additional blade 25 on'the bolt 10 outwardly of the bar 1, which projects beyond the adjacent end of the frame and is sharpened'both along its outer edge and the adjacent loweredge'p'ortion.

This blade is for the purpose of making-an initial slit in a pipe etc. circumferentially thereof. This is-done by resting the endof the blade diagonally against the end of the pipe and hitting down on said blade asindicated in Figure 1. This ven? ables the pipe to; be then supportedacross the implement is shifted to a positionparallel to the wall so that said wall does not'interfere with the strips; another bolt being mounted on the bench in'the necessary position to maintain the implement in such parallel relationship. The blade 11, owing to its convexly-curved cuttingedge and ,to its shortnesamw also be efficiently used for cuttingout acircle in flat sheet metal. In this case of course the sheet metal is aid across the frame bars in front of. the blade and turned and guidedbyhand against the blade as the latter is reciprocated back and forth by operating the handle."

From the foregoing description it will readilyseenthat I have produced such a device as sub- 'stantially fulfills the objects ofthe invention as set forth herein. I V V V V While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to' as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent'is:

1. A sheet metal cutter comprising a horizontal bar adapted tobe mounted in a fixed positionand with its upper edge forming. a stationary blade, a

movable blade having a longitudinal slot open to i the outer end of the blade, a pin fixed in the bar and normally engaging the bottom of the slot to form a pivot for the blade, a handle member pivoted on the bar beyond the pin for swivel movement in a vertical plane, removable stop means limiting the movement of the handle in one direction, and cooperating disengageable elements on the pivot end of the handle and onthe blade beyond the slotto operate said blade with a movement of the handle; said elements being arranged for disengagement from each other only when the, stop means is removed to permit further turning of the handle whereby the blade may then be moved to withdraw: the slot from about thepin.

r 2. A sheet metal cutter comprising a horizontal bar adapted to be'mounted in a fixed position and with its upper edge forming a stationary blade, a movable blade pivoted on one side of said:

bar to cooperate with said edge, the" blade being pointed, and a sharp ended starter blade to make an initial slit ina cylindrical member to be cut pivoted on thebar on the side opposite irom the first named blade and adapted'to be lowered whennot in use to a level below the upper edge of the' bar.

3. A cutting device comprising a horizontal member forming a fined blade, a movable blade alongside and cooperatingwith said 'fixed blade,

an operating handle longitudinally alined with" and beyond saidmovable blade,.disengageable operating connections betweenthe adjacent ends of the movable blade and handle to reciprocate the blade with the reciprocation of the handle and ar- 7 ranged for disengagement onlyiwhen' the handle is turned beyond a predetermined operativelimitjf and means, including a non-removable pin mounting'the movable blade on the bar ,for removal therefrom only when the connections are disengaged. I 

